US 12,264,831 B2
Defrosting control method and device, and multi-split air conditioner
Lianfa Wu, Guangdong (CN); Mengmeng Jin, Guangdong (CN); Tian Qiu, Guangdong (CN); and Chuantao Shen, Guangdong (CN)
Assigned to Gree Electric Appliances, Inc. of Zhuhai, Guangdong (CN)
Appl. No. 18/014,892
Filed by Gree Electric Appliances, Inc. of Zhuhai, Guangdong (CN)
PCT Filed Oct. 11, 2021, PCT No. PCT/CN2021/123085
§ 371(c)(1), (2) Date Jan. 6, 2023,
PCT Pub. No. WO2022/127309, PCT Pub. Date Jun. 23, 2022.
Claims priority of application No. 202011494245.6 (CN), filed on Dec. 17, 2020.
Prior Publication US 2023/0250984 A1, Aug. 10, 2023
Int. Cl. F24F 11/42 (2018.01); F24F 11/61 (2018.01); F24F 11/64 (2018.01)
CPC F24F 11/42 (2018.01) [F24F 11/61 (2018.01); F24F 11/64 (2018.01)] 14 Claims
OG exemplary drawing
 
1. A defrosting control method, comprising:
detecting whether each external heat exchanger of external heat exchangers in a multi-split air conditioner meets a preset defrosting condition;
controlling the multi-split air conditioner to enter a continuous heating and defrosting mode under a condition that any external heat exchanger meets the preset defrosting condition;
detecting sequentially whether the each external heat exchanger in the multi-split air conditioner is currently in a frostless state according to a sequence of priority levels of the external heat exchangers in a descending order;
marking directly a currently detected external heat exchanger as having finished defrosting under a condition that the currently detected external heat exchanger is currently in a frostless state;
defrosting the currently detected external heat exchanger under a condition that the currently detected external heat exchanger is currently in a frosted state, and marking the currently detected external heat exchanger as having finished defrosting after defrosting; and
controlling the multi-split air conditioner to exit the continuous heating and defrosting mode under a condition that all the external heat exchangers are marked as having finished defrosting,
wherein detecting whether each external heat exchanger is currently in a frostless state comprises:
detecting whether an ambient temperature of the currently detected external heat exchanger is greater than a preset temperature threshold;
counting an operation time of the currently detected external heat exchanger before the multi-split air conditioner enters the continuous heating and defrosting mode under a condition that the ambient temperature of the currently detected external heat exchanger is greater than the preset temperature threshold;
detecting whether a continuous downtime of the currently detected external heat exchanger is greater than a preset downtime threshold under a condition that the operation time is 0; and
determining the currently detected external heat exchanger is currently in a frostless state under a condition that the continuous downtime is greater than the preset downtime threshold.
 
7. A non-transitory computer readable storage medium storing computer instructions which, when executed by a processor, implement the defrosting control method of claim 1.
 
8. A defrosting control device, comprising:
a processor; and
a memory coupled to the processor, storing program instructions which, when executed by the processor, cause the processor to:
detect whether each external heat exchanger of external heat exchangers in a multi-split air conditioner meets a preset defrosting condition;
control the multi-split air conditioner to enter a continuous heating and defrosting mode under a condition that any external heat exchanger meets the preset defrosting condition;
detect sequentially whether the each external heat exchanger in the multi-split air conditioner is currently in a frostless state according to a sequence of priority levels of the external heat exchangers in a descending order;
mark directly a currently detected external heat exchanger as having finished defrosting under a condition that the currently detected external heat exchanger is currently in a frostless state;
defrost the currently detected external heat exchanger under a condition that the currently detected external heat exchanger is currently in a frosted state, and mark the currently detected external heat exchanger as having finished defrosting after defrosting; and
control the multi-split air conditioner to exit the continuous heating and defrosting mode under a condition that all the external heat exchangers are marked as having finished defrosting,
wherein detecting sequentially whether each external heat exchanger in the multi-split air conditioner is currently in a frostless state according to a sequence of priority levels of the external heat exchangers in a descending order, causes the processor to:
detect whether an ambient temperature of the currently detected external heat exchanger is greater than a preset temperature threshold;
count an operation time of the currently detected external heat exchanger before the multi-split air conditioner enters the continuous heating and defrosting mode under a condition that the ambient temperature of the currently detected external heat exchanger is greater than the preset temperature threshold;
detect whether a continuous downtime of the currently detected external heat exchanger is greater than a preset downtime threshold under a condition that the operation time is 0; and
determine the currently detected external heat exchanger is currently in a frostless state under a condition that the continuous downtime is greater than the preset downtime threshold.
 
14. A multi-split air conditioner, comprising:
the defrosting control device, comprising:
a processor; and
a memory coupled to the processor, storing program instructions which, when executed by the processor, cause the processor to:
detect whether each external heat exchanger of external heat exchangers in a multi-split air conditioner meets a preset defrosting condition;
control the multi-split air conditioner to enter a continuous heating and defrosting mode under a condition that any external heat exchanger meets the preset defrosting condition;
detect sequentially whether the each external heat exchanger in the multi-split air conditioner is currently in a frostless state according to a sequence of priority levels of the external heat exchangers in a descending order;
mark directly a currently detected external heat exchanger as having finished defrosting under a condition that the currently detected external heat exchanger is currently in a frostless state;
defrost the currently detected external heat exchanger under a condition that the currently detected external heat exchanger is currently in a frosted state, and mark the currently detected external heat exchanger as having finished defrosting after defrosting; and
control the multi-split air conditioner to exit the continuous heating and defrosting mode under a condition that all the external heat exchangers are marked as having finished defrosting,
wherein detecting sequentially whether each external heat exchanger in the multi-split air conditioner is currently in a frostless state according to a sequence of priority levels of the external heat exchangers in a descending order, causes the processor to:
detect whether an ambient temperature of the currently detected external heat exchanger is greater than a preset temperature threshold;
count an operation time of the currently detected external heat exchanger before the multi-split air conditioner enters the continuous heating and defrosting mode under a condition that the ambient temperature of the currently detected external heat exchanger is greater than the preset temperature threshold;
detect whether a continuous downtime of the currently detected external heat exchanger is greater than a preset downtime threshold under a condition that the operation time is 0; and
determine the currently detected external heat exchanger is currently in a frostless state under a condition that the continuous downtime is greater than the preset downtime threshold.